Telephone-exchange system.



H. P. CLAUSEN.

[ELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED APR-15. 1916.

Patented Aug. 28, 1917.

UNITED STATES PATET OFFIQE.

HENRY IP. CLAUSEN, OF MOUNTVERNON, NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Aug. 28, 1917.

Application filed April 15, 1916. Serial N 0. 91,451.

To all whom it may concern Be it known that I, HENRY PETER CLAUsnN, a citizen of the United States, residing at Mount Vernon, in the county of IVestchester and State of New York, have invented certain new and useful Improve ments in TelephoneExchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone 6X- change systems, and more particularly to circuit arrangements for selectively operable switching devices in automatic telephone exchanges.

It is the object of this invention to reduce the number of switching devices necessary for the establishment of connections in eX- changes of the above mentioned type.

In automatic telephone systems having a capacity of more than ninety-nine lines, it has been the practice to provide a first selector switch which may be set in accordance with the first set of impulses corresponding to the hundreds designation of the called line, in order to select an idle one in the group of trunks leading to a sec ondary selector or connector. The called subscribers line may be seized by setting the connector in accordance with two sets of impulses, corresponding to the tens and units designation of the called line. This arrangement was found the most satisfaetory for use in connection with an impulse sender by means of which impulses on the decimal bases may be sent out.

It is the main object of this invention to provide a circuit arrangement under the control of which a single switching device may perform the functions of the above mentioned primary and secondary selector switches.

The drawings represent a preferred embodiment of this invention, only so much be ing shown of the switches and the circuit arrangements for operating the same as is necessary for a clear understanding of the invention.

A subscriber, located at station 1, desiring to obtain a connection with a station 2, removes his receiver from the switchhook, whereupon his line is extended in the wellknown manner by manually or automatically operated means, to a trunk line 3, A. A circuit is completed through the windings of a relay 5, the trunk 3, 4i and the calling substation for energizing this relay, which in turn causes the energization of a slowacting relay 6. The calling subscriber now operates his calling device 17 for sending out the first set of impulses. In response to each impulse sent out by the calling subscriber, relay 5 releases its armature once. Relay 6, being slow to release, will not fall off during the vibration of the armature of relay 5, and therefore, in response to the first impulse, a circuit is closed for a slowacting relay 7, which in turn causes the energization of a side switch magnet 8. The side switch wipers, however, are moved only upon the deenergization of magnet 8. A circuit is also closed from ground through the armature and back contact of relay 5,

the armature and front contact of relay 6,

a side switch wiper 9 and a vertical magnet 10 to grounded battery. The vertical magnet is thus operated under the control of relay 5 and steps brushes 11 of a connector 12 in a vertical direction. After the termination of the first set of impulses, relay 5 holds its armature attracted, thus maintaining the circuit of relay 6, but opening the circuit of relay 7 for a sufiicient length of time to permit the retraction of this relay, whereupon the side switch magnet 8 becomes denergized and moves the side switch wipers into their second position.

The next series of impulses will again be received by the vertical magnet 10, due to the fact that in both the first and second positions of the side switch, wiper 9 connects the back contact of relay 5 to this magnet. After the termination of the second series of impulses the side switch is moved into the third position in the same manner as above described, in which position the tens impulses will be sent through side switch wiper 9 to rotary magnet 13. Under the control of this magnet the wipers 11 are moved in a rotary direction. The same rotary magnet receives in the fourth position of the side switch the units impulses for selecting the called subscribers line. In this position ringing current is applied to the called line through side switch wipers 14 and 15, and the side switch wipers are moved into their fifth position in the manner disclosed in Patent No. 1,189,458 to A. E.Lundell, in response to the removal of the receiver at the called station. The calling subscriber will be supplied with battery through the windings of relay 5, and the called subscriber through the windings of a relay 16.

The release of the switches may proceed in the manner disclosed in the mentioned patent to A. E. Lundell.

Obviously the present invention is applicable to selector switches of widely varying character, and may be advantageously used in connection with selector switches having one motion to select a group under the directive control of a subscriber or operator, and a secondary motion for automatically selecting an idle trunk in the selected group.

If the called line terminals are located in the fifteenth rotary and eleventh vertical level of the connecter bank, the connector may be set onto these terminals under the control of eight and seven vertical, and six and five rotary impulses. The capacity of the connector bank and the number of switches employed in building up a connection depends on the size of the exchange. In order to permit the seizure of terminals located in the first rotary and vertical levels by sending out two sets, vertical and rotary, of impulses, these first levels are made accessible only in response to two sets or" impulses, that is to say, a subscribers line located in the first rotary level of the first vertical level may be reached by sending out twice one vertical and twice one rotary impulse.

lVhat is claimed is:

1. In a telephone exchange system, a plurality of lines, a selector switch for interconnecting two of said lines, an impulse sending mechanism, and means for operating said selector switch in accordance with more than three complete operations of said mechanism for causing it to establish the desired connection.

2. In a telephone exchange system, a plurality of lines, a selector switch for interconnecting two of said lines, an impulse sending mechanism, and means for moving said switch in two planes in accordance with more than three complete operations of said mechanism to establish the desired connection.

3. In a telephone exchange system, a plurality of lines, a. selector switch for interconnecting two of said lines, an impulse sending mechanism, a primary and a secondary magnet for operating said selector switch, and means for operating each of said magnets in accordance with two complete operations of said mechanism.

IL. In a telephone exchange system, a selector switch comprising movable and stationary contacts, incoming lines terminating in said movable and outgoing lines terminating in said stationary contacts, an impulse sending mechanism for controlling said movable contacts, and means associated with said selector switch for permitting the setting of said movable contacts in accordance with more than three complete operations of said mechanism for causing the seizure of the desired stationary contacts.

In witness whereof, I hereunto subscribe my name this letth day of April, A. D. 1916.

HENRY P. CLAUSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

